Portable focusing dark room.



0. M. O-ITE. PORTABLE rocusmc DARK ROOM.

APPLICATION FILED OCT. 18. i917. il fifi m w j Patented May-14,1918. Y 2 SHEETS-SHEET I.

0. an. em. PORTABLE FOCUSlNG DARK ROOM.

APPLICATION FILED OCT-1B. 1911- Patented May 14, 1918.

2 SHEETS-SHEET Z.

cannon.

' time n. o'r'rnor mntnsrown, NEW-roan. ronrannn rocnsme' DARK BOOM.

, 1,266,525; Specification of Letters Patent; P te t d y 1a, 1913,

' l Application filed October 15,1917. Seria1No.197,854.'

To all whomitmay concern: is a front elevation of the dark room .upon 55' Be it known that I O'rrro M. Oirrn, a citiits support showing in'dotted line the path zen of the 'United "states, residing at the and scope of the test tube and the; line of the city of Jamestown, in' the county of Ohaushadow light around the shaft of light When, 5 tauqua and State of New York, have in-. said shaft of light is in perfect alinement.

vented certain new and useful Improve- Fig. 5 is a sectional view at line 5-5 in Fig. 60 ments in Portable Focusing, Dark Rooms, 1 showing the ground glass plate and the of which the following, taken in connection cross thereon with the darkenedcentral por-J with the accompanying drawings, is a specitionupon which the shaft 'of light is cenfication. i tered,- the center of the darkcross lines being The purpose of the invention is to provide 5 the center of said shaft of lightand of the 65 a portable chamber or dark room witha prodark room. Fig. 6 is a side elevation of the tecting screen in one end whichpermits the ortable dark room a spaceddistance in admission of a shaft of light but shuts out grout ofan'automobile -he'ad light, illustrat- I all other rays of light excepting said parallel ing the manner of centering'thesame, the rays coming from one direction, and providdotted'c'entral lines outlining the shaft of 70 ing a peep hole in the other end to enable light within-the dark room and the dotted the operator to center said shaft of light; side lines'the shadow light, the adjustment and second, providing said dark room about as to height of the dark room upon its standmidway of its length with a glass centering ard being shown in dotted outline. Fig. 7 is plate for a light shaft, the outer portions of a side elevation of the measuring 'st'andardffit said glass centering plate having a ground for the head light and'dark room in order to surface and the central portion a gray or equalize the height.- Fig. v8 isa topv plan darkened, surface with a dark lined cross viewof the dark room; and finder or-test which divides the circular interior of the tube. v V j round dark room into quarters, thereby-ren- Like characters of reference refer to cor- 8'0 .derin it more easy to discover any defarresponding parts in the several views. ture rom center by the rays of light an ,en- The humeral 10 designates the darkroom abling the operator to direct a shaft of light which is preferably made in thelcylindrical from a head light or search light into' said form with a conical shaped rear end 11 and dark room in the day light and exactly cen-' a peep hole 12 in the apex- ,of said rear end. 4 .ter the'same,'means being provided for ad- The cylinder 10'is adjustably supported 1 justing the height of the dark room above upon a standard 13 andtripod 14 by means its supporting surface so that the owner of o the clamping lever 15; with its cam-shaped 85 "an" automobile who desires to center the inner end which: clamps firmly against the shaft oflight from each of his head lightsv standard 13 holding it at any 'desiredheight. a0 at a certain distance from said head lights A tube .16 around-the standard 13 extends and' at acertain distance above the'roadway through the cylinder 10 and 'is blackened may accom lish said centering of his head throu h its central \ortion, as shown in Fig. 401i hts in t e day: timewith accuracy and 5, to orm one of t e focusing cross lines. v .without-the need of a.darkened room or; A plate 17, preferably of ound glass, waiting until the night time; and the invenhas its outer portion 18 grounf so -as to rention consistsinthe novel features and combider the same translucent to-light and its nations hereinafter set, forth and claimed. central portion 19- darkened so as to dis' 45' In the drawings, Figure 1 -is a partial sectinguish between the ground glass portion tional elevation of the portable dark room 18 and the darkened portion 19. Through showing the construction and arrangement the darkened portion 19 the tube .16 is also of the same as well' as the manner of its darkened to form the vertical-focusing line adjustable support upon a standard." Fig. 2 20 and a horizontal cross line 21 is also 60 is'a rear elevation of the darkroom showing darkened while the tube 16 and cross line 21 the testing tube swing arm pivotal thereon; throughout the ound glass portion 18 is v and Fig. 3 is a detail {elevation of the weight lightened or ma e white so as to mark the and clamping ring .for holding the testing same through said ground glass portion tube in position upon its swing arm. Fig. 4 thereby not only the'darkened central portion '19 but the ground glass portion ,lj

18'1nto four equal parts which are marked. by the letters A, B, C and D.

A light protecting screen 22 is provided in the front end of the cylinder10', that is,

the end opposite the peep hole .12 filling the whole of said '-front end. Sai screen. may be made in different desi s but is pref: erably made of alternate. at strips and V-shaped corrugated strips 24: welded to one another and of suflicient depth. to prevent the ingress of false light or'othe'r light than the light shaft yet not interruptin I the shaft of light as it is directed into the ark room.

A finder or test tube 25 is mounted on an arm 26 which arm is rotatably mounted 1 around the peep hole 12 on the rear end of 1 the dark room.; The finder 25 is held in the correct horizontal position by means of the clamping ring 27 which extendsarou'nd the tube and the weighted bracket piece 28 which hangs pivotally upon the arm 26 as shown in section in Fig. 1, so that in all positions of. the arm 25 the weighted bracket piece 28 will hold the tube 25 with its rear [end 29 vertical softh'at the operator can look 'down into the same-through thelens. The arm 26 is of sufficient length so that said test tube 25 is held a spaced distance outside the line ofthe shadow light as shown by lines 30 in Fig. 6" and 31 in Fig. l so that if the operatorcansee-light in the test tube .25 at any .part of the .arc shown in Fig. 4 then the shaft 10f I lightwhich is indicated by-the dotted lines 32 in Fig. 6' is out-of center and the position of the head light 33 must be adjusted accordingly, the operator jbeing enabled to see when it is .centeredby lookingthrough the peep hole 12. Imperfect reflec- .10 may be leveled in x the head light 33.

'- which may be set atthe shaft "32 at the front of the head light 33,

tors for the head lights 33 reflect imperfect shaped shafts of light and may cause upward flares of light that are-pear shaped or elliptical shaped, which peculiar shapes are discovered by the operator in lookingv through the pee hole 12 for such irregular sha es will be s own upon theground glass an may extend up into the field of .the

finder or test tube 25. A level 38 is prof vided on the side of the test tube 25 so'that said test tube andthe dark room cylinder In order to adjust the dark room 10 to the correct height for the lamp 33, a standard 34 is provided having a clamping gage 35 top of the light and a seriesof gage steps 36 are provided on the dark room cylinder 10 so that the de-' sired height can be measured exactly by placing the gage standard 34 with its gage 35 upon the correct step of the series 36.

In'operation the dark room .is laced at the desired distance from the hea light 33 and the owner of the. car may look through placing the same before the peep hole 12 while a mechanic adjusts the head light 33, the 'car owner directing the adjustment until the shaft of light is centered upon the dark portion 19 of the glass 17. The owner of the light can easily direct the mechanic by calling oifthe quarters A, B, O or D within which the light 'encroaches and when so centered the car.

owner should look within the finding tube 25 and if he can see any light at any-portion of the are 37 he will know at once that his light is not perfectly centered and can adjust the lamp and move the finder back and forth until he corrects the fault and thus perfects the centering of thelight."

It is apparent that this simple dark room I indicating the centering of said parallel light ray 2. A device of the class described comprising .a darkened receptacle, .a light intercepting screen in one end of said receptacle having small tubular openings there-' through which admit. only the parallel rays of the light shaft, and means for indicating the centering ofsaid light shaft in said re:

ceptacle. i I

3. A device for-determining the center'ofand the like, comprising a dark room, a

the field oflight of an automobile headlight light intercepting screen in one end of said dark rooinwhich admits only. parallel rays froma shaft of light, a peep hole in the 1 otherend' of saiddark room, and means in said" dark room for indicating the centering of said shaft of light. 1 Y

4. A device for determining the center of the. field of light of an automobile headlight and'the like, comprising an adjustable dark room, alight interceptingscreen in one end of said dark room which admits only the parallel rays .of a light shaft, a peep hole in the otherend of said dark room, and intercrossed lines .in said dark room dividing the space thereof into fractional portions-to assist in centering said'light in said dark room.

prising an adjustably supported cylinder, a multiple tubular light screen in one end of said cylinder which admits only. the parallel rays of' a light shaft to the interior of. said"- cylinder, a peep hole in the other end of said cylinder, aground glass partition in" 5. A device of'the class described comglass dividing the same into fractional portions to determine the center of the areaof said light shaft in said cylinder.

6. A devlce of the class described comprising an adjustably supported cylinder, a multiple tubular light screen in one end of said cylinder which admits only the parallel rays of a light shaft to the interior of said cylinder, a peephole in the other end of said cyhnder, a ground glass partition in said cylinder between said peep screen, a darkened central portion in said ground glass and lines crossed at the center to divide the interior of said cylinder into quarter sections both in said darkened cen-- ter and the ground-glass outer portion in said partition to center said shaft of light within-said cylinder.

7. A device for determining the center I of the field of light of an automobile headlight and the like, comprising a cylindrical dark room, a light intercepting screen in one end of said cylindrical dark room which admits only the parallel rays of a light shaft,

drical dark centering in said dark room of said light shaft, a support for said dark .ro0m,-and means for adjusting the position of said cylindrical-dark room on said support and means on said tube for clamping said standard to adjust the height of said dark room 40 with respect to the headlight.

,8. In a device of the class described, a centering dark room fora shaft of light, a

tube extending throughv said dark room, a

standard slidably fitting on said ,tu be, and

above a supporting surface.

9. A device of the class described comprising an adjustable dark room having means for indicating the centering of a shaft of light, said centering of said shaft of light.

" 10. A device of the class described comprising an adjustable dark room having means for indicating thecentering of a shaft of light, and a-' test tube movable in the arc of a circle and mounted beyond the exterior of said darkroom to test the accuracy of the centerof said shaft of light in different positions in relation to. said dark room.

between said peep hole and hole and in the other end of said cylinroom, means for indicating the and a test tube movable exteriorly ofv dark room to test the accuracy of the I entering the chambe position on said arm in relation to said I a level on said test tube to dark room, and level said dark room. v

12. 'A device of the class described comprising an adjustable dark room having means for indicating the centering of a shaft of light, and a gage on said dark room to measure the height of said dark room in relation to said shaft of light. 13. In a device for determining the center of the field of light of an automobile head light, a dark chamber, means toadjustably support the chamber in front of the head light, a screen in the chamber to select parallel light rays entering same, and means in the chamber for indicating the centering of the field of light entering the chamber.

14. In a device for determining the center of the field of light of an automobile head light, a dark chamber, means to adjustably support the chamber in front of the head light, a gage on ablergage means for the headlight, and means in the "chamber for indicating the centering of the field of light of the headlight.

15. A device for determining the center of the field of light of automobile headlights and the like, including meansfor indicating the centering of'the fieldof' light from the said first named means in front of the headlight. A device for determinin the center. of the field of light of automob' e headlights and, the like, including a dark chamber,

headlight, means to select parallel light ra s r, and means int e chamber. for indicating the centering of the field of light from In testimon the headlight. whereof I have afixed my signature int e presence of two witnesses.

OTHO M. OT'IE. Witnesses:

II. A. Smears,

E. Nonnsrnom.

headlight, and means to support means to support the chamber in front of the 

